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Class 9 Chemistry Physical States Of Matter 1. Convert the following units:(d) 1.25 \mathrm{~atm} to \mathrm{Pa}


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1. Convert the following units:(d) 1.25 \mathrm{~atm} to \mathrm{Pa}

5. Define the term allotropy with examples.
5. Define the term allotropy with examples.

5. Define the term allotropy with examples.

11. The vapour pressure of a liquid increases with the:(a) increase of pressure(b) increase of temperature(c) increase of intermolecular forces(d) increase of polarity of molecules
11. The vapour pressure of a liquid increases with the:(a) increase of pressure(b) increase of temperature(c) increase of intermolecular forces(d) increase of polarity of molecules

11. The vapour pressure of a liquid increases with the:(a) increase of pressure(b) increase of temperature(c) increase of intermolecular forces(d) increase of polarity of molecules

1. Convert the following units:(c) 560 torr to \mathrm{cm} \mathrm{Hg}
1. Convert the following units:(c) 560 torr to  \mathrm{cm} \mathrm{Hg}

1. Convert the following units:(c) 560 torr to \mathrm{cm} \mathrm{Hg}

A sample of neon gas occupies a volume of 75.0 \mathrm{~cm}^{3} at very low pressure of 0.4 \mathrm{~atm} . Assuming temperature remain constant what would be the volume at 1.0 \mathrm{~atm} . pressure?
A sample of neon gas occupies a volume of  75.0 \mathrm{~cm}^{3}  at very low pressure of  0.4 \mathrm{~atm} . Assuming temperature remain constant what would be the volume at  1.0 \mathrm{~atm} . pressure?

A sample of neon gas occupies a volume of 75.0 \mathrm{~cm}^{3} at very low pressure of 0.4 \mathrm{~atm} . Assuming temperature remain constant what would be the volume at 1.0 \mathrm{~atm} . pressure?

5. Which one of the following is not amorphous?(a) rubber(b) plastic(c) glass(d) glucose.
5. Which one of the following is not amorphous?(a) rubber(b) plastic(c) glass(d) glucose.

5. Which one of the following is not amorphous?(a) rubber(b) plastic(c) glass(d) glucose.

1. How many times liquids are denser than gases?(a) 100 times(b) 1000 times(c) 10000 times(d) 100000 times
1. How many times liquids are denser than gases?(a) 100 times(b) 1000 times(c) 10000 times(d) 100000 times

1. How many times liquids are denser than gases?(a) 100 times(b) 1000 times(c) 10000 times(d) 100000 times

Differentiate between crystalline and amorphous solids.
Differentiate between crystalline and amorphous solids.

Differentiate between crystalline and amorphous solids.

Define boiling point and also explain how it is affected by different factors.
Define boiling point and also explain how it is affected by different factors.

Define boiling point and also explain how it is affected by different factors.

2. Convert the following units:(d) 172 \mathrm{Kto}^{\circ} \mathrm{C} .
2. Convert the following units:(d)  172 \mathrm{Kto}^{\circ} \mathrm{C} .

2. Convert the following units:(d) 172 \mathrm{Kto}^{\circ} \mathrm{C} .

Define and explain Charles law of gases.
Define and explain Charles law of gases.

Define and explain Charles law of gases.

2. Convert the following units:(c) 100 \mathrm{~K} to ^{\circ} \mathrm{C}
2. Convert the following units:(c)  100 \mathrm{~K}  to  ^{\circ} \mathrm{C}

2. Convert the following units:(c) 100 \mathrm{~K} to ^{\circ} \mathrm{C}

What is vapour pressure and how it is affected by intermolecular forces.
What is vapour pressure and how it is affected by intermolecular forces.

What is vapour pressure and how it is affected by intermolecular forces.

1. Convert the following units:(d) 1.25 \mathrm{~atm} to \mathrm{Pa}
1. Convert the following units:(d)  1.25 \mathrm{~atm}  to  \mathrm{Pa}
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1. Convert the following units:(d) 1.25 \mathrm{~atm} to \mathrm{Pa}

1 . Define Boyles law and verify it with an example.
 1 . Define Boyles law and verify it with an example.

1 . Define Boyles law and verify it with an example.

At freezingpoint which one of the following coexists in dynamic3. equilibrium:(a) gas and solid(b) liquid and gas(c) liquid and solid(d) all of these
At freezingpoint which one of the following coexists in dynamic3. equilibrium:(a) gas and solid(b) liquid and gas(c) liquid and solid(d) all of these

At freezingpoint which one of the following coexists in dynamic3. equilibrium:(a) gas and solid(b) liquid and gas(c) liquid and solid(d) all of these

785 \mathrm{~cm}^{3} of a gas was enclosed in a container under a pressure of 600 \mathrm{~mm} \mathrm{Hg} . If volumes is reduced to 350 \mathrm{~cm}^{3} what will be the pressure?
 785 \mathrm{~cm}^{3}  of a gas was enclosed in a container under a pressure of  600 \mathrm{~mm} \mathrm{Hg} .  If volumes is reduced to  350 \mathrm{~cm}^{3}  what will be the pressure?

785 \mathrm{~cm}^{3} of a gas was enclosed in a container under a pressure of 600 \mathrm{~mm} \mathrm{Hg} . If volumes is reduced to 350 \mathrm{~cm}^{3} what will be the pressure?

6. In which form sulphur exists at 100^{\circ} \mathrm{C} .
6. In which form sulphur exists at  100^{\circ} \mathrm{C} .

6. In which form sulphur exists at 100^{\circ} \mathrm{C} .

9. Which one of the following does not affect the boiling point?(a) intermolecular forces(b) external pressure(c) nature of liquid(d) initial temperature of liquid
9. Which one of the following does not affect the boiling point?(a) intermolecular forces(b) external pressure(c) nature of liquid(d) initial temperature of liquid

9. Which one of the following does not affect the boiling point?(a) intermolecular forces(b) external pressure(c) nature of liquid(d) initial temperature of liquid

4. What do you mean by evaporation how it is affected by surface area.
4. What do you mean by evaporation how it is affected by surface area.
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4. What do you mean by evaporation how it is affected by surface area.

It is desired to increase the volume of a fixed amount of gas from 87.5 to 118 \mathrm{~cm}^{3} while holding the pressure constant. What would be the final temperature if the initial temperature is 23^{\circ} \mathrm{C} .
It is desired to increase the volume of a fixed amount of gas from  87.5  to  118 \mathrm{~cm}^{3}  while holding the pressure constant. What would be the final temperature if the initial temperature is  23^{\circ} \mathrm{C} .
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It is desired to increase the volume of a fixed amount of gas from 87.5 to 118 \mathrm{~cm}^{3} while holding the pressure constant. What would be the final temperature if the initial temperature is 23^{\circ} \mathrm{C} .

Example 5.1A gas with volume 350 \mathrm{~cm}^{3} has a pressure of 650 \mathrm{~mm} of Hg. If its pressure is reduced to 325 \mathrm{~mm} of \mathrm{Hg} calculate what will be its new volume?
Example 5.1A gas with volume  350 \mathrm{~cm}^{3}  has a pressure of  650 \mathrm{~mm}  of Hg. If its pressure is reduced to  325 \mathrm{~mm}  of  \mathrm{Hg}  calculate what will be its new volume?
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Example 5.1A gas with volume 350 \mathrm{~cm}^{3} has a pressure of 650 \mathrm{~mm} of Hg. If its pressure is reduced to 325 \mathrm{~mm} of \mathrm{Hg} calculate what will be its new volume?

A sample of oxygen gas has a volume of 250 \mathrm{~cm}^{3} at -30^{\circ} \mathrm{C} . If gas is allowed to expand up to 700 \mathrm{~cm}^{3} at constant pressure find out its final temperature.
A sample of oxygen gas has a volume of  250 \mathrm{~cm}^{3}  at  -30^{\circ} \mathrm{C} . If gas is allowed to expand up to  700 \mathrm{~cm}^{3}  at constant pressure find out its final temperature.
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A sample of oxygen gas has a volume of 250 \mathrm{~cm}^{3} at -30^{\circ} \mathrm{C} . If gas is allowed to expand up to 700 \mathrm{~cm}^{3} at constant pressure find out its final temperature.

7. What is the relationship between evaporation and boiling point of a liquid?
7. What is the relationship between evaporation and boiling point of a liquid?
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7. What is the relationship between evaporation and boiling point of a liquid?

A gas occupies a volume of 800 \mathrm{~cm}^{3} at 1 \mathrm{~atm} when it is allowed to expand up to 1200 \mathrm{~cm}^{3} what will be its pressure in \mathrm{mm} of \mathrm{Hg} .
A gas occupies a volume of  800 \mathrm{~cm}^{3}  at  1 \mathrm{~atm}  when it is allowed to expand up to  1200 \mathrm{~cm}^{3}  what will be its pressure in  \mathrm{mm}  of  \mathrm{Hg} .
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A gas occupies a volume of 800 \mathrm{~cm}^{3} at 1 \mathrm{~atm} when it is allowed to expand up to 1200 \mathrm{~cm}^{3} what will be its pressure in \mathrm{mm} of \mathrm{Hg} .

A gas at pressure 912 \mathrm{~mm} of \mathrm{Hg} has volume 450 \mathrm{~cm}^{3} . What will be its volume at 0.4 atm.
A gas at pressure  912 \mathrm{~mm}  of  \mathrm{Hg}  has volume  450 \mathrm{~cm}^{3} . What will be its volume at  0.4  atm.
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A gas at pressure 912 \mathrm{~mm} of \mathrm{Hg} has volume 450 \mathrm{~cm}^{3} . What will be its volume at 0.4 atm.

3. Why are the densities of gases lower than that of liquids?
3. Why are the densities of gases lower than that of liquids?
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3. Why are the densities of gases lower than that of liquids?

The largest moon of Saturn is Titan. It has atmospheric pressure of 1.6 \times 10^{5} \mathrm{~Pa} . What is the atmospheric pressure in atm? Is it higher than earths atmospheric pressure?
The largest moon of Saturn is Titan. It has atmospheric pressure of  1.6 \times 10^{5} \mathrm{~Pa} . What is the atmospheric pressure in atm? Is it higher than earths atmospheric pressure?
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The largest moon of Saturn is Titan. It has atmospheric pressure of 1.6 \times 10^{5} \mathrm{~Pa} . What is the atmospheric pressure in atm? Is it higher than earths atmospheric pressure?

8. Which one of the following gas diffuses fastest?(a) hydrogen(b) helium(c) fluorine(d) chlorine
8. Which one of the following gas diffuses fastest?(a) hydrogen(b) helium(c) fluorine(d) chlorine
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8. Which one of the following gas diffuses fastest?(a) hydrogen(b) helium(c) fluorine(d) chlorine

1. Convert the following units:(a) 850 \mathrm{~mm} Hg to atm
1. Convert the following units:(a)  850 \mathrm{~mm}  Hg to atm
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1. Convert the following units:(a) 850 \mathrm{~mm} Hg to atm

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